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6973

 
    
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The 6973 is an audio beam tetrode for use in Hi-Fi amplifiers and was designed by RCA in about 1957 - just as stereo amplification was taking off.
The 6973 as a push-pull pair operating in Class AB1 was rated at 20 Watts output at 1.5% THD with 350 Volts on the anodes. For a Class A single ended amplifier the anode voltage would be 250 Volts. The figures in the table below are for the Class A use.
Robert Coleman says that these were used as a pair driving two KT66s in a Leslie rotating speaker.
The RCA name.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 70 mm tall.
Reference: Datasheet. Type 6973 was first introduced in 1957.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2
-
g1
h
h
g1
k,bp
g2
a

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.45
250
250
-15
46.0
3.5
7,800
4.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 21, 2017.
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